package com.max.xihu.concurrent.day01;

import java.util.HashMap;
import java.util.Map;

/**
 * @Author: Max
 * @Date: 2020-07-05 02:50
 * @Description:
 */
public class Job{

    public static void main(String[] args) {
        Map<Long,Double> map = new HashMap<>();
        map.put(1L,0.1);
        System.out.println(map.get(null));
    }
}
